Polish rod clamp



April 4, 1939. l. NAY-LOR ET Al. 2,153,474

POLISH RD CLAMP Filed May 20. 1958 ATTORNEYS Patented Apr. 4, 1939 UNITED STATES Ira Naylor and Burl Yost, Winegars, Application May 20, 1938 Serial N0.' 209,129

. 2 Claims. (Cl. 24-243) This invention relates to clamps, more vparticularly to clamps for use in connection` lwith polish rods for supporting a string of sucker rods in oil well pumping apparatus.

Due to the jarring conditions under which polish rod clamps operate they are apt to become loosened with resultant loss of the sucker rods. With this disadvantage in mind an object of the present invention is to provide a polish rod clamp which may be readily applied to and removed from the polish rod and when in applied position Will positively grip the rod so that jarring strains cannot dislodge the clamp.

A further object is to provide a clamp of this type which will be formed of a few strong and durable parts, which will be inexpensive to manufacture and which will not easily get out of order.

With the above and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modifications may be resorted to within the scope of the appended claims Without departing from the spirit or sacricing any of the advantages of the invention.

In the accompanying drawing forming part of this specification,

Figure l is a longitudinal sectional view of a polish rod clamp constructed in accordance with the invention.

Figure 2 is a cross sectional View of the clamp taken on the line 2--2 of Figure 1 and showing the clamp about to be applied to a polish rod.

Figure 3 is a cross sectional view of the clamp showing the clamp applied to the polish rod.

Figure 4 is a perspective view of the core and head of the clamp.

Figure 5 is a perspective view of the body of the clamp.

Figure 6 is a perspective view of the jaw of the clamp. i

Figure 7 is a side elevation of the clamp with parts broken away.

Referring now to the drawing in which like characters of reference 4designate similar parts in the various views, I0 designates the body of the clamp, the same being of hollow cylindrical formation and provided at one side with a handle II, best shown in Figure 7. Opposite the handle the body is provided with an opening I2 extending the entire length of the body and adapted to permit the body to be slid laterally on to the polish rod I3, as best shown in Figure 2.

The body is provided in its inner wall with a longitudinal groove I4 best shown in Figure 5 and mounted in this groove is a' jaw lbest-'shown in Figure 6. The jaw is in the nature of a bar having concave face I6 which 'may be plain or corrugated as desired. A screw I'I is engaged through an opening'.v I8 in the body, fas besti-'rshown in Figure 1,'and is threadedlyvvengaged in an opening I9 in the jaw to secure the jaw to the body for movement in a radial direction for application to and release from the polish rod I3. A helical spring 20 is sleeved upon the screw and is conilned under tension between the head of the screw and the inner wall of an opening 2| in the body, in which the spring is seated. The purpose of the spring is to withdraw the jaw from the sucker rod when the clamp screws 22 are loosened.

The clamp screws 22 are threadedly engaged in openings 23 formed in the body above and below the opening I8. These screwsbear against the rear face of the jaw and when tightened move the jaw readily against the tension of the spring 20 to tightly bind the concave face of the jaw against the side of the polish rod, as best shown in Figure 3.

A core 24 is rotatably mounted within the body and is provided at the upper end'with a disc-like head 25 which is supported upon the top of the body, as best shown in Figure 1. The core is equal in length to the body, and it and the head are provided with aligned slots 26 and 21, which, 30

in one position of these parts, register with the opening I2 in the side of the body. When the slots are in registration` with the opening the clamp may be slipped laterally on to the polish rod. After the application of the clamp to the polish rod the head and core are turned to move their slots out of registration with the opening in the body and thereby prevent the lateral displacement of the clamp from the polish rod.

The head 25 is provided with a handle 28 through the medium of which it and the core may be turned. Turning movement of the core is limited by a screw 29 carried by the body and fitting in an arcuate groove 30 formed in the core.

Since the operation of the clamp has been described as the description of the parts progressed it is thought that the invention will be fully understood without further explanation.

What is claimed is:

1. A polish rod clamp comprising a hollo cylindrical body having a longitudinal slot in one side extending from end to end of the body to permit the body to be slipped laterally on to a polish rod, the body being provided on the inner wall with a longitudinal groove'lextending from end to end of the body, a clamping jaw seated in said groove, a screw slidably tted in the body and connected to the jaw for supporting the jaw in position, a spring sleeved on the screw and engaging the body, said spring constantly tending to urge said jaw into said longitudinal groove, screws Y threadedly engaged with the body on opposite sides of the rst named screw and adapted to be advanced against the jaw to move the jaw into clamping engagement with the polish rod, a core rotatably mounted within the body and having. a

longitudinal slot in one side adapted to align with the slot in the body at one limit of move,- ment to receive the polish rod and adapted to align with said longitudinal groove inthe body at the opposite limit of movement to vpermit said said groove, a screw slidably tted in the body and connected to the jaw for supporting the jaw in position, a spring sleeved on the screw and engaging the body, said spring constantly tending to urge said jaw into said longitudinal groove, screws threadedly engaged with the body on opposite sides of the iirst named screw and adapted to be advanced against the jaw to move the jaw into clamping engagement with the polish rod, a core rotatably mounted within the body and havinga longitudinal slot in one side-adapted to align with the slot in the body'at o-ne limit of movement to receive the polish rod and adapted to align with said longitudinal groove in the body at the 'oppositeflimit of movement to permit said jaw to pass into the core and engage the polish rod, a head on the corebearing against the topi of the body, a handle-on, said head, a handle on said body, there being an arcuate groove formed in the outer wall of said core, and a screw engaged through said body and entering said arcuate groove for limiting rotary movement of the core relatively to the body.

IRA NAYLOR.

BURL YOST. 

